Move ui_test_utils::RunMessageLoop to test_utils so that it can be reused by content_browsertests.

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 104 matching lines @@
     DCHECK(hs);
     hs->QueryDownloads(
         &callback_consumer_,
         base::Bind(&DownloadsHistoryDataCollector::OnQueryDownloadsComplete,
                    base::Unretained(this)));
 
     // TODO(rdsmith): Move message loop out of constructor.
     // Cannot complete immediately because the history backend runs on a
     // separate thread, so we can assume that the RunMessageLoop below will
     // be exited by the Quit in OnQueryDownloadsComplete.
-    ui_test_utils::RunMessageLoop();
+    content::RunMessageLoop();
   }
 
   bool GetDownloadsHistoryEntry(DownloadPersistentStoreInfo* result) {
     DCHECK(result);
     *result = result_;
     return result_valid_;
   }
 
  private:
   void OnQueryDownloadsComplete(
@@ skipping 891 matching lines @@
       NULL,
       1);
   bool download_assempted;
   ASSERT_TRUE(content::ExecuteJavaScriptAndExtractBool(
       chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
       L"",
       L"window.domAutomationController.send(startDownload());",
       &download_assempted));
   ASSERT_TRUE(download_assempted);
   observer.WaitForObservation(
-      base::Bind(&ui_test_utils::RunMessageLoop),
+      base::Bind(&content::RunMessageLoop),
       base::Bind(&MessageLoop::Quit,
                  base::Unretained(MessageLoopForUI::current())));
 
   // Check that we did not download the file.
   FilePath file(FILE_PATH_LITERAL("download-test1.lib"));
   FilePath file_path(DestinationFile(browser(), file));
   EXPECT_FALSE(file_util::PathExists(file_path));
 
   // Check state.
   EXPECT_EQ(1, browser()->tab_count());
@@ skipping 1449 matching lines @@
   GetDownloads(browser(), &download_items);
   ASSERT_EQ(1u, download_items.size());
   ASSERT_EQ(test_server()->GetURL("echoheader?Referer"),
             download_items[0]->GetOriginalUrl());
 
   // Check that the file contains the expected referrer.
   FilePath file(download_items[0]->GetFullPath());
   std::string expected_contents = test_server()->GetURL("").spec();
   ASSERT_TRUE(VerifyFile(file, expected_contents, expected_contents.length()));
 }